<?php

class Db {
  /**
   * Use the PROFILER constant in the config of a Zend_Db_Adapter.
   */
  const PROFILER = 'profiler';

  /**
   * Use the CASE_FOLDING constant in the config of a Zend_Db_Adapter.
   */
  const CASE_FOLDING = 'caseFolding';

  /**
   * Use the FETCH_MODE constant in the config of a Zend_Db_Adapter.
   */
  const FETCH_MODE = 'fetchMode';

  /**
   * Use the AUTO_QUOTE_IDENTIFIERS constant in the config of a Zend_Db_Adapter.
   */
  const AUTO_QUOTE_IDENTIFIERS = 'autoQuoteIdentifiers';

  /**
   * Use the ALLOW_SERIALIZATION constant in the config of a Zend_Db_Adapter.
   */
  const ALLOW_SERIALIZATION = 'allowSerialization';

  /**
   * Use the AUTO_RECONNECT_ON_UNSERIALIZE constant in the config of a Zend_Db_Adapter.
   */
  const AUTO_RECONNECT_ON_UNSERIALIZE = 'autoReconnectOnUnserialize';

  /**
   * Use the INT_TYPE, BIGINT_TYPE, and FLOAT_TYPE with the quote() method.
   */
  const INT_TYPE = 0;
  const BIGINT_TYPE = 1;
  const FLOAT_TYPE = 2;

  /**
   * PDO constant values discovered by this script result:
   *
   * $list = array(
   *    'PARAM_BOOL', 'PARAM_NULL', 'PARAM_INT', 'PARAM_STR', 'PARAM_LOB',
   *    'PARAM_STMT', 'PARAM_INPUT_OUTPUT', 'FETCH_LAZY', 'FETCH_ASSOC',
   *    'FETCH_NUM', 'FETCH_BOTH', 'FETCH_OBJ', 'FETCH_BOUND',
   *    'FETCH_COLUMN', 'FETCH_CLASS', 'FETCH_INTO', 'FETCH_FUNC',
   *    'FETCH_GROUP', 'FETCH_UNIQUE', 'FETCH_CLASSTYPE', 'FETCH_SERIALIZE',
   *    'FETCH_NAMED', 'ATTR_AUTOCOMMIT', 'ATTR_PREFETCH', 'ATTR_TIMEOUT',
   *    'ATTR_ERRMODE', 'ATTR_SERVER_VERSION', 'ATTR_CLIENT_VERSION',
   *    'ATTR_SERVER_INFO', 'ATTR_CONNECTION_STATUS', 'ATTR_CASE',
   *    'ATTR_CURSOR_NAME', 'ATTR_CURSOR', 'ATTR_ORACLE_NULLS',
   *    'ATTR_PERSISTENT', 'ATTR_STATEMENT_CLASS', 'ATTR_FETCH_TABLE_NAMES',
   *    'ATTR_FETCH_CATALOG_NAMES', 'ATTR_DRIVER_NAME',
   *    'ATTR_STRINGIFY_FETCHES', 'ATTR_MAX_COLUMN_LEN', 'ERRMODE_SILENT',
   *    'ERRMODE_WARNING', 'ERRMODE_EXCEPTION', 'CASE_NATURAL',
   *    'CASE_LOWER', 'CASE_UPPER', 'NULL_NATURAL', 'NULL_EMPTY_STRING',
   *    'NULL_TO_STRING', 'ERR_NONE', 'FETCH_ORI_NEXT',
   *    'FETCH_ORI_PRIOR', 'FETCH_ORI_FIRST', 'FETCH_ORI_LAST',
   *    'FETCH_ORI_ABS', 'FETCH_ORI_REL', 'CURSOR_FWDONLY', 'CURSOR_SCROLL',
   * );
   *
   * $const = array();
   * foreach ($list as $name) {
   *    $const[$name] = constant("PDO::$name");
   * }
   * var_export($const);
   */
  const ATTR_AUTOCOMMIT = 0;
  const ATTR_CASE = 8;
  const ATTR_CLIENT_VERSION = 5;
  const ATTR_CONNECTION_STATUS = 7;
  const ATTR_CURSOR = 10;
  const ATTR_CURSOR_NAME = 9;
  const ATTR_DRIVER_NAME = 16;
  const ATTR_ERRMODE = 3;
  const ATTR_FETCH_CATALOG_NAMES = 15;
  const ATTR_FETCH_TABLE_NAMES = 14;
  const ATTR_MAX_COLUMN_LEN = 18;
  const ATTR_ORACLE_NULLS = 11;
  const ATTR_PERSISTENT = 12;
  const ATTR_PREFETCH = 1;
  const ATTR_SERVER_INFO = 6;
  const ATTR_SERVER_VERSION = 4;
  const ATTR_STATEMENT_CLASS = 13;
  const ATTR_STRINGIFY_FETCHES = 17;
  const ATTR_TIMEOUT = 2;
  const CASE_LOWER = 2;
  const CASE_NATURAL = 0;
  const CASE_UPPER = 1;
  const CURSOR_FWDONLY = 0;
  const CURSOR_SCROLL = 1;
  const ERR_NONE = '00000';
  const ERRMODE_EXCEPTION = 2;
  const ERRMODE_SILENT = 0;
  const ERRMODE_WARNING = 1;
  const FETCH_ASSOC = 2;
  const FETCH_BOTH = 4;
  const FETCH_BOUND = 6;
  const FETCH_CLASS = 8;
  const FETCH_CLASSTYPE = 262144;
  const FETCH_COLUMN = 7;
  const FETCH_FUNC = 10;
  const FETCH_GROUP = 65536;
  const FETCH_INTO = 9;
  const FETCH_LAZY = 1;
  const FETCH_NAMED = 11;
  const FETCH_NUM = 3;
  const FETCH_OBJ = 5;
  const FETCH_ORI_ABS = 4;
  const FETCH_ORI_FIRST = 2;
  const FETCH_ORI_LAST = 3;
  const FETCH_ORI_NEXT = 0;
  const FETCH_ORI_PRIOR = 1;
  const FETCH_ORI_REL = 5;
  const FETCH_SERIALIZE = 524288;
  const FETCH_UNIQUE = 196608;
  const NULL_EMPTY_STRING = 1;
  const NULL_NATURAL = 0;
  const NULL_TO_STRING = NULL;
  const PARAM_BOOL = 5;
  const PARAM_INPUT_OUTPUT = -2147483648;
  const PARAM_INT = 1;
  const PARAM_LOB = 3;
  const PARAM_NULL = 0;
  const PARAM_STMT = 4;
  const PARAM_STR = 2;

  protected static $_adapter;

  protected function __construct() {
    
  }

  public static function factory() {
    if (self::$_adapter == NULL) {
      global $dbconfig;
      require_once 'Db/Adapter/Mysql.php';
      self::$_adapter = new Db_Adapter_Mysql($dbconfig);
    }
    return self::$_adapter;
  }

}